A recent study reveals that an immense tsunami, reaching a height of 481 meters, was triggered by a massive rockfall into an Alaskan fiord last year. This event highlights the catastrophic potential of such tsunamis and underscores the need for policymakers, especially in British Columbia, to prioritize the risks associated with these waves.
The study, led by Dan Shugar, an associate professor at the University of Calgary, emphasizes the significant impact of the Tracy Arm Fjord tsunami, pointing out the ecological devastation caused by the wave. The research, published in the journal Science, indicates that the rapid retreat of a glacier, which would have intercepted the landslide, played a crucial role in the formation of the tsunami.
According to the study, the landslide, totaling over 64 million cubic meters, plunged into Tracy Arm Fjord at 5:26 a.m. on Aug. 10, 2025, resulting in a wave with a staggering run-up height of 481 meters. The region, known for its cruise ship tourism, faces a growing risk of similar disasters due to ongoing glacier retreat and expanding infrastructure.
Fortunately, the one cruise ship present in the fiord at the time of the tsunami was not directly impacted. Researchers, including Aram Fathian, a postdoctoral researcher at the University of Calgary, stress the potential magnitude of the disaster if a cruise ship had been in the path of the tsunami.
The study also highlights the role of human-induced warming in glacier retreat, leading to increased landslide risks in fiord regions. The researchers urge policymakers to assess these risks carefully and invest in early warning systems to mitigate the threat posed by future tsunamis.
In conclusion, while the Geological Survey of Canada is already evaluating fiord hazards, there is a call for a national-level consideration of these risks by policymakers. The study underscores the importance of proactive measures to safeguard coastal communities from the potential devastation of landslide-triggered tsunamis.
